Pressure gauge for tires



July 1 1924.

, 1,499,328 A. BADowsKl PRESSURE GAUGE!v FOR TIRES Filed Jan. 22. 192'1 l Patented July 1, 1924.

starsSIAPATENTermee."

ALFRED Banowsnr, or CHARLESTON, `WEST VIRGINIA, AssrGnoR, RY MESNE Asmaar srennrnnrs, To Taneaenjvanvn coRroRaT-ron, or cnaRIJasTo'N,y WEST VIR`- Giura, A CORPORATION or WEST vrnarnrra. i

PRnssURn GAUGE FOR TIRES.

Appncaun filed January 22,1921. serial no. 439,065.

To all whom t may concern.' f

Be it known that lf, ALFRED BADowsKI, a citizen of the United States, residing at Charleston, in the co-unty of Kanawha and State of West Virginia, have invented new and useful Improvements in Pressure Gauges for Tires, of which the following is a specification.

This vdevice is designed for registering pressure in receptacles such as pneumatic tires. It is importa t that the device be as small as possible so that it may beI used as a tire stem and pass through the standard openings in felloes. 1t is also desirable that 1 marks an inner tube, 2 a tire, 3 a wheel rim, 1 a felloe, and 5 a valve stem opening through the felloe. The pressure gauge `is carried by the stem or sleeve 6 which eX- tends through the opening 5. The stem has a head 7 with corrugations 8 on its face. The tube 1 is clamped between this corrugated head and a corrugated washer 9. A spreader 10 rests on the washer 9 and the' parts are secured by a nut 11. vA nut 12 secures the stem in the felloe.

A plunger 13 having a central passage` 14 is slidingly and rotatably mounted in the sleeve. An inside valve 15 is screwed into the portion 16 of the passage 14. The active element 17 ofV the valve checks an outflow of air and has the guide stem 18 and is actuated by a spring 19. The plunger has the usual screw threads 2O for a pump connection, these screw threads also serving to secure the usual cap 2l. y

r1`he plunger has a scale 22L indicating the pressure to which the plunger is subjected. The numerals onl the scale are staggered so that they may be made larger. The plunger ing the tube.

ysprings may be adjuste as shown in Fig. r2 is freeito rotate infthe sleeve, thus making a smaller sizeJ of sleeve fpossible and simplifying the construction but making 'the position of the scale uncer-f tain. `The scale, therefore, -is carried entirely around theV plunger so that it may be observed from opposite sides of the plunger.

The plunger has a stepped extension, one step 24 receiving a rubber tube 25, the tube being' secured by a wrapping 26, a shoulder 27 at the end of the step 24 aiding in secur- The larger step 28 is screwthreaded and a spring 29 screwed on to these screw threads.` A space 30 between the screw and the plunger permits the adjustment of the sprino` so that different to compensate for variations. AnI anchor piece 31 is inserted from the inner end of the sleeve opening.'

The anchor piece has a stepped extension.

The rubber tube 25 is secured on the smaller 'step 32 by a wrapping 33, the step having a shoulder 34 at its end to aid in securing the tube. The larger step has a screw 35 into which the lower end of the spring is screwed to secure the spring to thevanchor piece. The larger step has a space 36 below the screw 35 to permit of adjusting the spring. The anchor piece has a closure plate 37 which.` is screwed into a screw-threaded socket 38 at the inner end of the head. The closure plate seats on a gasket 39. The gasket seats on the base of the socket and is y confined by a yshoulder l10 on the anchor piece so that as the closure plate is screwed into place a perfect seal is made and the engagement .of the gasket tends to lock the anchor piece in place. The anchor piece has a wrench-hold 11 and is `provided with a passage 31a through which air passes to the tube.

The screws 28 and 85 have the same direction of pitch as the screw 20. The twisting p force on the plunger through act-ion on the screw 20, therefore, expands Lthe springt 29 into engagement with thesleeve, thus lock ing further turning of the plunger. The plunger may, however, be positively locked against turning in the manner shown in Fig. 4 wherein the plungerfhas a key-way 13a and the sleeve is indented to form a key 6a. The key may thus be formed after the parts are assembled.

vinthe *alternative construction shown in Fig. 5` the closure plate y38a is pressed into the socket38, the structure being otherwise similar to that of Fig. 2. 1

In Fig. 6 the sleeve opening continues with uniform diameter through the head, the inner end ofthe opening being screwthreaded and the anchor piece 81h screwed into place, a sealing cement being used on the threads to assure a complete closure.

In the construction shown in Fig. 7 the closure plate 37b is forced into the socket 38h, the gasket being omitted.

In operation air is pumped throu h the valve in the plunger to the tire. s the pressure in the tire increases the plunger is forced outwardly and the pressure is indi- X cated'by the scale.

What I'claiin as new is- In a pressure gauge for tires, the combination With a tire stem of a plunger in the Vot the plunger; a rubber tube secured to the inner end of the plunger; and a head on the inner end oi' the stem, the stem and head having aligned openings, of van anchor piece insertable into the inner end of the openings and YForming a closure for'said 0penings, said anchor piece having a nipple for securing the tube and a shoulder for securing the inner end of the spring.

In testimony whereof I have hereunto set my hand.

ALFRED BADOWSKI. 

